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Discontinued Operations - Assets and Liabilities Held For Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Disposal Group Including Discontinued Operation Balance Sheet Disclosures [Abstract]    
Current assets held for sale   $ 3,113us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Long-term assets held for sale 650us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsNoncurrent 2,005us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsNoncurrent
Total assets held for sale 650us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation 5,118us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
Current liabilities held for sale   536us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
Total Liabilities held for sale   536us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
Net assets and liabilities held for sale $ 650aeti_DisposalGroupIncludingDiscontinuedOperationNetAssetsAndLiabilities $ 4,582aeti_DisposalGroupIncludingDiscontinuedOperationNetAssetsAndLiabilities